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[LDM #CSR-510794]: archiving raw model grib fields from the ldm feed
- Subject: [LDM #CSR-510794]: archiving raw model grib fields from the ldm feed
- Date: Tue, 28 Oct 2008 07:22:28 -0600
Hi Bill,
Sorry for the tardy reply. We are holding training workshops at the moment,
so it is more difficult to respond quickly to new user inquiries.
re:
> We are trying to edit our pqact.conf to capture the raw (plain good olde
> grib) files as well as parse them through the decoders into gempak
> format. However, we are somewhat flummoxed as to the syntax even though
> we are sure that it should be somewhat obvious given some of our other
> extractions of raw data from the feed such as mesonet data. We've also
> tried deconstructing examples provided with ldm for other products and
> we are hitting our heads against the wall.
>
> Do you have any recommendations here, for example, to archive a stream
> of grib segments from the gfs or nam for a given time and forecast hour
> straight to its native grib file, and each file being marked with the
> appropriate time and date of the forecast?
Yes. The first thing you should do us use the LDM facility 'notifyme'
to make sure that you are receiving the data you want to save. For instance:
<as 'ldm'>
notifyme -vlx- -f HRS -o 3600 <- if HRS is the data feed in question
'notifyme' will list the products received including their product IDs.
You should look at those product IDs to see if the date and time is available.
For instance, here is some output for some of the RUC2 grib products currently
being received in the HRS datastream:
Oct 28 13:13:24 notifyme[17599] INFO: 594d1d79ac2d500fdf6eb2bcfdbdc82a 21458
20081028131322.873 HDS 101949182 YOWB85 KWBG 281200 /mRUC2
!grib/ncep/RUC2/#236/200810281200/F001/VVEL/850 mb/
Oct 28 13:13:24 notifyme[17599] INFO: 00541d0b1614e6906df060cd377adfdb 21458
20081028131323.148 HDS 101949183 YUWB30 KWBG 281200 /mRUC2
!grib/ncep/RUC2/#236/200810281200/F001/UGRD/300 mb/
Oct 28 13:13:24 notifyme[17599] INFO: b01cb5657e22a3c8d70041f86ef47c93 23592
20081028131323.148 HDS 101949184 YVWB20 KWBG 281200 /mRUC2
!grib/ncep/RUC2/#236/200810281200/F001/VGRD/200 mb/
Notice that the date and time is available in the product ID for each of these
products.
One simple example for a ~ldm/etc/pqact.conf action that would file these
products into
individual files using the date and time from the product ID is:
HRS grib/ncep/RUC2/#(.*)/(....)(..)(..)(..)(..)/.*/(.*)
FILE -close data/hrs/grib/\7_\2\3\4_\5\6.\1
NOTE:
- certain whitespace in pqact.conf actions are tabs:
- whitespace between HRS and grib is a tab
- whitespace before and after FILE are tabs
- whitespace after -close is a tab
- this action should produce files named:
~ldm/data/hrs/grib/VVEL_20081028_1200.236
etc.
- please be aware that this is only meant to be an illustrative example
If you send us the pqact.conf file you are trying to modify so we can see
how you would like to file the products, we can look it over to see what,
if anything is not correct.
> Thanks Much
No worries.
Cheers,
Tom
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Ticket Details
===================
Ticket ID: CSR-510794
Department: Support IDD
Priority: Normal
Status: Closed